Payroll and Public Holiday

Hi I have run my payroll for the week and we had a public holiday. I run a spreadsheet for all my employees wages noting what is overtime and public holidays, RDO sick etc.

When I ran the Payrun Activity for that Payrun the Public Holiday amount of hours is not the same as my spreadsheet. I have double checked to make sure all who are entitled to the PH have been paid. I have more on my spreadsheet thank what MYOB is calculating. I even got a separate person to check incase I missed something but that is not the case.  My report says 500hrs but my spreadsheet says 507.6hrs so I would assume I didn't pay someone a full Public Holiday. I have had this happen before and could not find where the error was, and no one complained of not being paid the Public Holiday. Has anyone ever had this happen and how do I fix it.

thanks